RT Journal Article SR Electronic T1 Minimising the environmental impact of inhaled therapies JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 2000721 DO 10.1183/13993003.00721-2020 VO 55 IS 5 A1 Lauri Lehtimäki A1 Unnur Björnsdóttir A1 Christer Janson A1 Tari Haahtela YR 2020 UL http://erj.ersjournals.com/content/55/5/2000721.abstract AB